source: trunk/hal/tsar_mips32/hal_context.h @ 12

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1/*
2 * hal_context.h - Generic Thread Context Access API definition.
3 *
4 * Author  Alain Greiner    (2016)
5 *
6 * Copyright (c) UPMC Sorbonne Universites
7 *
8 * This file is part of ALMOS-MKH.
9 *
10 * ALMOS-MKH is free software; you can redistribute it and/or modify it
11 * under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; version 2.0 of the License.
13 *
14 * ALMOS-MKH is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17 * General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with ALMOS-MKH; if not, write to the Free Software Foundation,
21 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24#ifndef  _HAL_CONTEXT_H_
25#define  _HAL_CONTEXT_H_
26
27//////////////////////////////////////////////////////////////////////////////////////////
28//        Generic Thread Context API definition (implementation in hal_context.c)
29//
30// A thread context is defined by the two (core specific) structures hal_context_t
31// and hal_uzone_t, defined  in hal_context.c file, that are accessed with generic
32// void* pointers stored in the thread descriptor.
33// - the "hal_context_t" structure is used to store the CPU registers values that
34//   have not been saved in the stack by the interrupt handler.
35// - the "hal_uzone_t" structure is used to save the FPU registers when required.
36//////////////////////////////////////////////////////////////////////////////////////////
37
38/**** Forward declarations ****/
39
40struct thread_s;
41
42/****************************************************************************************
43 * Define various SR values for TSAR-MIPS32
44 ***************************************************************************************/
45
46#define SR_USR_MODE       0xFC11
47#define SR_USR_MODE_FPU   0x2000FC11
48#define SR_SYS_MODE       0xFC00
49
50/****************************************************************************************
51 * This structure defines the cpu_context for TSAR MIPS32.
52 * These registers are saved/restored at each context switch.
53 * WARNING : update the hal_cpu_context_save() and hal_cpu_context_restore()
54 *           functions when modifying this structure.
55 ***************************************************************************************/
56
57typedef struct hal_cpu_context_s
58{
59        uint32_t s0_16;      // slot 0
60        uint32_t s1_17;      // slot 1
61        uint32_t s2_18;      // slot 2
62        uint32_t s3_19;      // slot 3
63        uint32_t s4_20;      // slot 4
64        uint32_t s5_21;      // slot 5
65        uint32_t s6_22;      // slot 6
66        uint32_t s7_23;      // slot 7
67        uint32_t sp_29;      // slot 8
68        uint32_t fp_30;      // slot 9
69        uint32_t ra_31;      // slot 10
70        uint32_t c0_sr;      // slot 11
71        uint32_t c0_th;      // slot 12
72        uint32_t c2_ptpr;    // slot 13
73        uint32_t c2_mode;    // slot 14
74} 
75hal_cpu_context_t;
76
77/****************************************************************************************
78 * This structure defines the fpu_context for TSAR MIPS32.
79 ***************************************************************************************/
80
81typedef struct hal_fpu_context_s
82{
83        uint32_t   fpu_regs[32];     
84}
85hal_fpu_context_t;
86
87/****************************************************************************************
88 * This function allocates, from the local cluster, the physical memory required for
89 * the thread CPU context, initialises it, and link the context to the thread.
90 * Seven registers are initialised:
91 * - sp_29 / fp_30 / ra_31
92 * - c0_sr / c0_th
93 * - c2_ptpr / c2_mode
94 ****************************************************************************************
95 * @ thread  : pointer on the thread descriptor.
96 * @ return 0 if success / return ENOMEM if error
97 ***************************************************************************************/
98error_t hal_cpu_context_create( struct thread_s * thread );
99
100/****************************************************************************************
101 * This function allocates, from the local cluster, the physical memory required for
102 * a thread CPU context, initialises it from values contained in "src" thread context,
103 * and link the context to the "dst" thread.
104 ****************************************************************************************
105 * @ dst  : pointer on the destination thread descriptor.
106 * @ src  : pointer on the source thread descriptor.
107 * @ return 0 if success / return ENOMEM if error
108 ***************************************************************************************/
109error_t hal_cpu_context_copy( struct thread_s * dst,
110                              struct thread_s * src );
111
112/****************************************************************************************
113 * This function releases the physical memory allocated for a thread CPU context.
114 ****************************************************************************************
115 * @ thread  : pointer on the thread descriptor.
116 ***************************************************************************************/
117void hal_cpu_context_destroy( struct thread_s * thread );
118
119/****************************************************************************************
120 * This function save in the thread context the CPU registers values that have not
121 * been saved in the thread stack by the exception handler:
122 * - GRs : s0 to S7 , sp , fp, ra
123 * - CP0 : th
124 * - CP2 : ptpr , mode
125 ****************************************************************************************
126 * @ thread  : pointer on the thread descriptor.
127 ***************************************************************************************/
128void hal_cpu_context_save( struct thread_s * thread );
129
130/****************************************************************************************
131 * This function restore from the thread context the CPU registers values that have not
132 * been saved in the thread stack by the exception handler.
133 * - GRs : s0 to S7 , sp , fp, ra
134 * - CP0 : th
135 * - CP2 : ptpr , mode
136 ****************************************************************************************
137 * @ thread  : pointer on the thread descriptor.
138 ***************************************************************************************/
139void hal_cpu_context_restore( struct thread_s * thread );
140
141/****************************************************************************************
142 * This function load the relevant CPU registers from values contained in
143 * the thread context. It should be called for a thread that has not been executed yet.
144 * - GRs : sp , fp , a0
145 * - CP0 : sr , epc , th
146 * - CP2 : ptpr , mode
147 * It reset the loadable flag in thread descriptor.
148 ****************************************************************************************
149 * @ thread  : pointer on the thread descriptor.
150 ***************************************************************************************/
151void hal_cpu_context_load( struct thread_s * thread );
152
153
154
155/****************************************************************************************
156 * This function allocates, from the local cluster, the physical memory required for
157 * the thread FPU context, and initialises the thread pointer.
158 ****************************************************************************************
159 * @ thread  : pointer on the thread descriptor.
160 * @ return 0 if success / return ENOMEM if error
161 ***************************************************************************************/
162error_t hal_fpu_context_create( struct thread_s * thread );
163
164/****************************************************************************************
165 * This function allocates, from the local cluster, the physical memory required for
166 * a thread FPU context, initialises it from values contained in "src" thread context,
167 * and link the context to the "dst" thread.
168 ****************************************************************************************
169 * @ dst  : pointer on the destination thread descriptor.
170 * @ src  : pointer on the source thread descriptor.
171 * @ return 0 if success / return ENOMEM if error
172 ***************************************************************************************/
173error_t hal_fpu_context_copy( struct thread_s * dst,
174                           struct thread_s * src );
175
176/****************************************************************************************
177 * This function releases the physical memory allocated for a FPU context.
178 ****************************************************************************************
179 * @ thread  : pointer on the thread descriptor.
180 ***************************************************************************************/
181void hal_fpu_context_destroy( struct thread_s * thread );
182
183/****************************************************************************************
184 * This function save in the thread uzone the FPU registers values.
185 ****************************************************************************************
186 * @ thread  : pointer on the thread descriptor.
187 ***************************************************************************************/
188void hal_fpu_context_save( struct thread_s * thread );
189
190/****************************************************************************************
191 * This function restore from the thread uzone the FPU registers values.
192 ****************************************************************************************
193 * @ thread  : pointer on the thread descriptor.
194 ***************************************************************************************/
195void hal_fpu_context_restore( struct thread_s * thread );
196
197#endif  /* _HAL_CONTEXT_H_ */
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